Plant diseases generate challenging problems in commercial, agriculture and pose real economic threats to both conventional and organic farming systems, so this all diseases need to be controlled to maintain the quality and abundance of food, feed, and fiber produced by growers around the world (Abdollahi, 2004). Different approaches may be used to prevent plant diseases. Beyond good agronomic and horticultural practices, growers often rely heavily on chemical fertilizers and pesticides.
Excessive use of chemicals has resulted in a rise in significant and dangerous in the proportion of soil and groundwater contamination, as well as a clear increase in the incidence of diseases of cancer among consumers in general and farmers in particular, where the studies suggest that the increase in cancer on the one hand and environmental pollution, on the other hand, is still on the rise continuously (Abdollahi, 2004). It is very important to prove scientifically that the biological control that considered an alternative to chemical fertilization and pesticide. The importance of this idea is reflected in a distinct area like Gaza, where the density of population is high and there is intensive agriculture in a narrow agricultural area. This situation forcing the farmers to excessive use of chemical fertilizers and pesticides to compensate for the deficiency of the agricultural land used. Moreover, the sandy nature of the soil facilitates the arrival of these chemicals into the groundwater causing significant pollution through irrigation. Putting effective alternatives for these farmers is of utmost importance to begin to develop a strategy aimed to reduce the use of chemical fertilizers and pesticides while maintaining appropriate agricultural production (MOA, 2014). In addition, it is worth mentioning also that the only source of drinking water in this region of the world is the groundwater wells that are directly affected by the use of a high amount of chemical fertilizers and pesticides. This is the ultimate goal of such researches that falls within an integrated system aimed at preserving the environment, drinking water, health and at the same time providing high agricultural productivity.